Thomas mocoubray



(No Model.)

T MGGOUBRAY i TELEPHONE TRANSMITTER. No. 527,214;

Patented Oct. 9, 1894.

Tn: nimma paens 00,. mmQu-mo., msmucwon n c UNITED STATES PATENT OFFICE.

THOMAS MCCOUBRAY, OF NEW YORK, N. Y.

TELEPHONE-TRANSMITTER.

SPECIFICATION forming part of Letters Patent No. 527,214, dated October 9, 1894.

Application tiled August 16, 1894. Serial No. 520,544. (No model.)

.To a/ZZ whom it may concern.-

Be it known that I, THOMAS MCCOUBRAY, a citizen of the United States, residing at New York, in the county of New York and State of New York, have madeanew and useful Invention in Telephonie Transmitters, of which the following is a specification.

My invention is directed particularly to improvements in telephonie transmitters ofthe Hunnings type in which carbon or equivalent c'omminuted material is used, and it has for its objects, first, the prevention, as far as possible, of the packing of the powder when in use; second, the accurate adjustment of the parts for the purpose of obtaining the best possible effects, and, third, the accomplishment of any and all results necessarily attributable to the apparatus hereinafter described, the essentially novel features of which are particularly pointed out in the claims at the end of this specification.

Referring now tothe drawings in detail in all of which like letters of reference represent like parts wherever used, Figure l is a sectional View of my improved form of transmitter taken through the body of the instrument. Figs. 2 and 3 are plan views from opposite sides of the metallic plates which hold the comminuted or powdered conducting material between them, and Fig. 4 isa sectional view of a modified form of the apparatus.

B represents the transmitter box and Athe mouthpiece secured by screw threads in the usual manner to the box and holding the diaphragm D firmly in position. This diaphragm is of any preferred'material and is provided at its center with an opening through which the electrode proper is supported, said electrode consisting of comminuted carbon or equivalent powder O which is held in a cylindrical cup G by metallic or other yielding disks F F'. This cup G is supported by a ring R and a stirrup E, the sustaining end of which projects through the diaphragm and is screw threaded for the reception of a nut n as clearly shown in Fig. 1 of the drawings.

s is an adjusting screw extending through the sustaining portion of the stirrup and having friction al bearing against the central portion of the disk F.

'w and fw are conductors running to the battery and usual circuit connections.

On examination of Figs. 2 and 3, it will be seen that the disks F and F are corrugated spirally and that said spiral corrugations are 0ppositely disposed so that when placed face to face in the manner shown in Figs. l and 4, they will rest upon the powder O in such way that when it tends to move in one direction by reason of its bearing upon the inner face of the disk F, it will have an equal tendency to move in a reverse direction by reason of its bearing upon the disk F', thus causing said powder to always maintain an equal distribution without any tendency to pack, a feature which is very objectionable in transmitters of the Hunnings type.

By turning the adjustment screw s in either direction the necessary adjustment is effected.

In the modified form shown in Fig. 4, a projecting pin e is sustained at the rear side of the stirrup E with its free end in mechanical connection with the central portion of the disk F', the adjustment screw sacting as before on the disk F.

Having thus described my invention, what I claim, and desire to secure by Letters Patent of the United States, is

l. A telephonie transmitterhaving an electrode of cumminuted or powdered conducting material sustained between a pair of conducting disks and a ring or cup which in turn is wholly sustained by a stirrup secured to the diaphragm. r

2. A telephonie transmitter having an electrode of comminuted or powdered conducting material sustained in aconfined position bya stirrup which in turn is secured to the diaphragm.

3. A telephonie transmitter having an electrode of comminuted or powdered conduct` ing material sustained in a confined position bya stirrup which in turn is secured to the diaphragm, in combination with additional means carried also by the diaphragm for ef-A fecting an adjustment of the electrode.

4. A telephonie transmitter provided with comminuted or powdered conducting material held in place by two disks having spirally corrugated surfaces.

5. A telephonie transmitter provided with comminuted or powdered conducting mate rial heldin place by two disks having spirally IOO corrugated surfaces, the spirals of which are f oppositely disposed.

Y 6. A telephonie transmitter having an electrode of comminuted or powdered conduct-- ing material sustained between a pair of conducting disks surrounded by a cup, or ring which in turnris wholly sustained by a stir rup detachably secured to the diaphragm.

7. A telephonie transmitter havinganfelecftrode of comminuted or powdered conducting material held between a pair of oonducting disks surrounded by a ring or cup secured to arstirrup which in turn is wholly -sustained at a point near the center of the diaphragm, in combination with an adjusting screw extending through the stirrup and i-n-to mechanical contact with one of the disks,

substantially as described.

9; A telephonictransmitter having an electrode of comminuted or powdered conducting material held in place by a pair of conducting; disks surrounded by a cup or ring detachably secured by a stirrup which in turn is detachably secured to the diaphragm, in com -A bination with an adjusting'screw extending through the diaphragm andthe stirrupnand having mechanicalconnection with one of the disks.

In testimony whereof I have hereunto subv THOMAS MCCOUBRAY.

Witnesses:

C. J. KINTNER, M. ROBINSON.

scribed my name this 14th day of August, 4o 

